﻿using System;
using System.Security.Cryptography;
using System.Text;

namespace Encryption.Cryptography
{
    public class CryptoProvider : ICryptoProvider
    {
        public string GetPassword(string input)
        {
            byte[] data = GetHashInternal(input);

            // Create a new Stringbuilder to collect the bytes
            // and create a string.
            StringBuilder sBuilder = new StringBuilder();

            // Loop through each byte of the hashed data 
            // and format each one as a hexadecimal string.
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }

            // Return the hexadecimal string.
            return sBuilder.ToString();
        }

        public bool VerifyPassword(string input, string encPassword)
        {
            byte[] data = GetHashInternal(input);

            // Create a new Stringbuilder to collect the bytes
            // and create a string.
            StringBuilder sBuilder = new StringBuilder();

            // Loop through each byte of the hashed data 
            // and format each one as a hexadecimal string.
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }

            // Return the hexadecimal string.
            return (String.Compare(sBuilder.ToString(), encPassword, false) == 0);
        }

        internal static byte[] GetHashInternal(string input)
        {
            using (HashAlgorithm ha = new SHA512CryptoServiceProvider())
            {
                // Convert the input string to a byte array and compute the hash.
                byte[] data = ha.ComputeHash(Encoding.UTF8.GetBytes(input));

                return data;
            }

        }
    }
}
